I bought my Cupra alloys with 225/45/17 tyres on, and had the wheels on for about half an hour. Wayyy too big and rubbed the arches even on a minor turn.
205/40/17 is what you need.
You can always flog the tyres depending on the condition. I sold the 225/45/17 that came with mine for £140 for the set which paid for almost half the price of the alloys![]()